公开(公告)号：US20170051566A1

公开(公告)日：2017-02-23

申请号：US14832712

申请日：2015-08-21

Applicant: CATERPILLAR INC.

Inventor： Richard Griffith MARSH ,  Gabriel John ELLICOTT ,  Michael H. NOBLE

IPC: E21B19/08 ,  E21B7/02

CPC classification number: E21B19/08 ,  E21B7/02

Abstract: A drilling drive system is provided. The drilling drive system has a mast having a longitudinal axis and a surface extending along the longitudinal axis. A bar is fixed to the surface of the mast and extends along the longitudinal axis. A plurality of rungs is disposed along the length of the bar, and a floating chain is disposed around the mast. A drive sprocket has a plurality of teeth that engage the plurality of rungs and the floating chain.

Abstract translation: 提供钻孔驱动系统。 钻孔驱动系统具有桅杆，其具有纵向轴线和沿着纵向轴线延伸的表面。 杆被固定到桅杆的表面并且沿着纵向轴线延伸。 沿着杆的长度设置多个梯级，并且在桅杆周围设置浮动链条。 驱动链轮具有与多个梯级和浮动链接合的多个齿。